Troubleshooting - Doosan DX140R Shop Manual

TROUBLESHOOTING

Please contact our company, when the disposal to which "O"
mark is attached is required.
Problem 1
Pressure will not
increase
Motor does not
turn
Pressure does
increase
Leaking from mating
surface
Leaking from case
Oil leakage
Leaking from
floating seal
Leaking from
hydraulic motor
increased leakage
of working fluid
During use on a
sloping road,
rotates under load
Parking brake does
not function
Reduction gear case surface temperature
too high
Travel Moter
Page 26
Problem 2
Relief set pressure is too
low
Pump failure
Direction switching valve is
damaged
Brake valve failure
Hydraulic motor failure
Gear (reduction) damage
Excessive load applied
Orifice of parking brake line
is blocked.
Flaws in surface
Bolts loose
Plug loose
Cracked by stone etc.
Worn-out sliding surface
O-ring creepage
Bolts loose
O-ring damaged
Seal surface flawed
Reduced hydraulic motor
capacity
Increased internal brake
valve leakage
Spring damage
Friction plate worn down
Shotage gear oil
Pitching in bearings
Working oil in gear case
Possible Cause Action
Check the main relief valve
Repair
Repair
Replace or repair brake valve
Repair
Replace GM motor
Remove excessive load
Remove the foreign materials.
Repair flaws with grinder, sand-
paper, etc.
Retighten
Retighten
Replace GM motor
Replace GM motor
Replace GM motor
Retighten
Replace O-ring
Repair flaws with grinder, sand-
paper, etc.
Replace GM motor
Replace or repair brake valve
Replace spring
Replace friction plate, mating
plate
Fit to recommended level
Replace GM motor
Replace oil seal
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SP001346